For whom the bell tolls

Manys the occaisions I have felt inadequate, stupid, that I was letting my patients down. But one day goes into the next and life goes on.
However, this was not to be for A.
He was a collegue of mine from medical school. I did not know him particularly well, travelling in different social circles.
He joined the army while in sixth form and continued to be in the army throughout medical school, and as for all those in the forces, he got a job at an army hospital.
The system there is different - you do a different job every month, which I suppose is good as you get more experience in a wide variety of areas.
Last month he was doing an orthopaedic rotation. The second rotation of his working life. Things weren't so easy tho. He felt unsupported and was not happy that there would be weeks where patients did not see a consultant. He found himself working longer and longer hours, as he tried to give the patients the best care he was able. Eventually the events of the day would haunt his evenings and insomnia set in. The lack of sleep started to affect his judgement and reflexes, which bothered him further, and his worrying took on epic and unreal proportions, to the point where he could be best described as psychotic.
Then came the final straw that broke the camels back. I don't know what it was, but it led to him taking an overdose, and to make doubly sure, hung himself. Where he was found the following day by another medical school mate, stationed at the same hospital.
What scares me most is that this could have been any of us. For which of us have not felt the same at some time in the past three months since we started working?
As John Donne said:

No man is an island,
Entire of itself.
Each is a piece of the continent,
A part of the main.
If a clod be washed away by the sea,
Europe is the less.
As well as if a promontory were.
As well as if a manner of thine own
Or of thine friend's were.
Each man's death diminishes me,
For I am involved in mankind.
Therefore, send not to know
For whom the bell tolls,
It tolls for thee.

A - this is for you. May your death not be in vain.

*NB - most of this story is based on hearsay - from two colleagues who were good friends with A and the unfortunate fellow house-officer who found him.